Hinge butt mortising tool



J1me 1957 E. A. KOZLOWSKI 2,794,461

HINGE; BUTT MORTISING TOOL 2 Sheets-Sheet 1 Filed May 20, 1955 IN VENTOR. EDWARD AKozLowsm June 4, 1957 E. A. KOZLOWSK! HINGE BUTT MORTISING TOOL 2 Sheets-Sheet 2 Filed May 20, 1955 AITQQHEYS United States Patent HINGE BUTT MORTISING TOOL Edward A. Kozlowski, Torrance, Calif.

Application May 20, 1955, Serial No. 509,834

4 Claims. (Cl. 144-27) This invention relates to devices for cutting mortises in the edges .of doors, door frames, or similar locations, adapted for the reception of hinges.

A main object of the invention .is to provide a novel and improved hinge butt mortising tool which is. simple in construction, which is easy to use, and which cuts a neat and precise mortise in a rapid and economical manner.

A further object of the invention is to provide an improved hinge butt mortising tool which is inexpensive to manufacture, which is rugged in construction, and which is readily adjustable to provide a desired depth of cut so that a hinge butt mortise maybe precisely and neatly fitted in place.

Further objects and advantages of the invention will become apparent from the following description and claims, and from the accompanying drawings, wherein;

Figure l is a perspective view of one form of improved hinge butt mortising tool constructed in accordance with he present invention... 1

Figure 2 is a transverse vertical cross sec ional view taken n th eel- 2 of Figure .1-

Figure 3' is a ertic l crcss ectional view takenon th line 33 of Figure 2.

Figure 4 is a vertical cross sectional view, similar to Figure 3, but showing a modified form of hinge butt mortising tool according to the present invention.

Figure 5 is a perspective inside view of the box-like main frame of the hinge butt mortising tool of Figure 4.

Figure 6 is a vertical cross sectional view, similar to Figure 4, but showing a still further modified form of hinge butt mortising tool according to the present invention.

Figure 7 is an enlarged perspective view of the carriage member employed in the form of the invention shown in Figure 6.

Referring to the drawings, and more particularly to Figures 1, 2 and 3, 11 generally designates an improved hinge butt mortising tool according to this invention, said tool comprising a generally rectangular box-like main frame 12 having a vertical rear wall 13 and respective vertical end walls 14, 14 substantially perpendicular to the rear wall 13. The frame member 12 has the top wall 15 formed integrally with the rear wall 13 and end walls 14, 14.

The bottom portions of the respective end walls 14, 14 and the rear wall 13 are formed with the sharp cutting edges, shown respectively at 16, 16 and 17, the rear portions of the end walls 14, 14 being extended downwardly, with respect to the cutting edges 16, 16, as is clearly shown in Figure 1 to define rearwardly facing vertical abutment shoulders 19, 19. Respective horizontal, vertically adjustable stop bars 20, 20 are provided on the outside surfaces of the end walls 14, 14, said bars being adjustably secured by means of respective machine screws 21, 21, engaged through vertical slots 22, 22 provided in each of the stop bars 20, whereby the stop bars 20 may be adjustably secured in proper position to provide a desired depth of cut of the implement.

The inside surfaces of the end walls 14, 14 are formed with the opposing horizontal guide ribs 25, 25. Designated at 26 is a carriage member which is formed at its opposite ends with notches 27, 27, slidably receiving the guide ribs 25, 25, the carriage member 26 being in the form of a generally rectangular block which is receivable inside the box-like frame 12. Designated at 28 is a horizontal cutting blade which is secured to the bottom edge of the block 26, as by suitable fastening screws 29, the blade 28 being supported in a horizontal position and being substantially coplanar with the edges 16', 17. Designated at 30 is a driving screw arranged horizontally and threadedly engaged through the center of the carriage member 26, said driving screw being provided at its outer end with the circular knob 31. The inner end of the driving screw is rotatably secured to the rear wall 13.

As shown in Figure 3, a machine screw 24 extends through a bearing washer 23 and through an aperture 34 in the rear wall 13, said machine screw being fhreadedly engaged in the end of the driving screw 36, to provide the rotative connection of the driving screw 30 to the rear wall 13.

In using the device, thetool is engaged on the edge 35 of the door or other object to be mortised, with the choir!- ders 19, 19 engaging the surface 36 perpendicular to the edge 35, whereby the tool is properly positioned for mortising. The tool is then driven downwardly by means of a hammer or other suitable driving tool to embed the cutting edges 16, 16 and 17 into thelelement to be mortised to a depth governed by the positions of the stop bars 20. The knob 31 is then rotated to cause :the carriage member '26 to. be advanced inwardly-through the frame member 12, causing the cutting blade 28 to :be forced through the material, whereby the material isusevered above the c ting bla e 28 and whereby the desire E191;- tise' is completely formed when the edge of theicutting blade ZSihasadva-nQed fully through the enclosure defined by the stationary blades 16, 16 and 17.

Referring now to the form of the invention shown in Figures 4 and 5, the box-like frame of the tool is designated generally at 12' and has the end walls 14', 14' and the rear wall 13'. The rear portions of the end walls 14, 14' and the lower portion of the rear wall 13' are recessed on their inside surfaces to define sockets to receive respective detachable cutting blades, shown at 16', 16" and 17', said cutting blades being of suitable length to provide a mortise of the desired depth, and being secured in their recesses by suitable fastening screws 21, as is clearly shown in Figure 5. The same carriage 26 and horizontal cutting blade 28 may be employed in the form of the invention of Figures 4 and 5 as in the form of the invention of Figures 1, 2 and 3, or alternatively, a modified carriage member 26', as shown in Figures 6 and 7, may be employed, said carriage member being provided with the horizontal cutting blade 28 which is formed at its ends with the vertical, upstanding blade elements 40, 40 having the arcuately curved top corner portions 41, 41.

In the embodiment of Figures 6 and 7, the frame 112 is provided only with the rear cutting blade 17 secured to rear wall 13, as shown. In operation of the device of Figures 6 and 7, the upstanding wing elements 49, 40 are received inside and closely adjacent to the end walls of the frame 112 whereby said end walls guide the wing elements inwardly as the carriage member 26 is forced inwardly toward the rear blade 17' by the action of the screw 30.

While certain specific embodiments of an improved hinge butt mortising tool have been disclosed in the foregoing description, it will be understood that various modifications within the spirit of the invention may occur to those skilled in the art. Therefore, it is intended that no 3 limitations be placed on the invention except as defined by the scope of the appended claims.

What is claimed is:

1. A hinge butt mortising tool comprisinga box-like frame having a Vertical rear wall and respective vertical end walls substantially perpendicular to said rear wall, the bottom portion of said rear wall and the bottom rear portions of said end walls being formed with cutting edges ,oifset upwardly with respect to the forward bottom portions of said end walls and defining the outline of a hinge butt recess, a carriage member received between and slidably engaged with said end walls, a cutting blade on said carriage member substantially coextensive with and facing said rear wall, and means for supporting said carriage member and for moving said carriage member toward sagill rear wall in a direction perpendicular to said rear w 2. A hinge butt mortising tool comprising a box-like frame having a vertical rear wall and respective vertical end walls substantially perpendicular to said rear wall, the bottom portion of said rear wall and the bottom rear portions of said end walls being formed with cutting edges ofiset upwardly with respect to the forward bottom portions of said end walls and defining the outline of a hinge butt recess, stop means projecting from said frame ar ranged to limit downward penetration of said cutting edges, a carriage member received between and slidably engaged with saidend walls, a cutting blade on said carriage member substantially coextensive with and facing said rear wall, and means for supporting said carriage member and for moving said carriage member toward said rear wall in a direction perpendicular to said rear wall.

3. A hinge butt mortising tool comprising a box-like frame having a vertical rear wall and respective vertical end walls substantially perpendicular to said rear'wall, the bottom portion of saidrear wall and the bottom rear portions of said end walls being formed with cutting edges oflfset upwardly with respect to the forward bottom portions of said end walls and defining the outline of a hinge butt recess, stop means projecting from said frame arranged to limit downward penetration of said cutting edges, a carriage member received between and slidably engaged with said end walls, a cutting blade on said carriage member substantially coextensive with and facing said rear wall, a horizontal screw member rotatably secured to said rear wall and threadedly engaged with said carriage member for moving said carriage member toward said rear wall, and interengaging guide means on said carriage member and end walls formed and arranged to support said cutting blade in a plane perpendicular to said rear wall.

4. A hinge butt mortising tool comprising a box-like frame having a vertical rear wall and respective vertical end walls substantially perpendicular to said rear wall, the bottom portion of said rear wall and the bottom rear portions of said end walls being formed with cutting edges ofiset upwardly with respect to the forward bottom portions of said end walls and defining the outline of a hinge butt recess, stop means projecting from said frame arranged to limit downward penetration of said cutting edges, horizontal opposing guide ribs on the inside surfaces of said end walls, a carriage member received be tween said end walls, the endtportions of said carriage member being formed with notches slidably engaged on said guide ribs, said guide ribs being formed and arranged to support said carriage member in a plane perpendicular to said rear wall, a cutting blade on-said carriage member substantially coextensive with and facing said rear wall, and a horizontal screw member rotatably secured to said rear wall and threadedly engaged with said carriage member for moving'said carriage member toward said rear wall.

References Cited in the file of this patent UNITED STATES PATENTS 724,966 Strubel Apr. 7, 1903 1,135,890 Gibson Apr. 13, 1915 1,417,431 Vogt May 23, 1922 1,430,874 Anderson Oct. 3, 1922 2,500,800 Carlson Mar. 14, 1950' 

